Problems with CAGradientLayer

Question

Im using the code

NSArray *buttons = [NSArray arrayWithObjects: self.rollBtn,nil];        
for(UIButton *btn in buttons)
{       
    btn.layer.shadowRadius = 3.0;
    btn.layer.shadowOffset = CGSizeMake(-2.0, -3.0);
    btn.layer.shadowOpacity = 0.5;
    btn.layer.shadowColor = [UIColor blackColor].CGColor;
    CAGradientLayer *btnGradient = [CAGradientLayer layer];
    btnGradient.frame = btn.bounds;
    btnGradient.colors = [NSArray arrayWithObjects:
                          (id)[[UIColor colorWithRed:102.0f / 255.0f green:102.0f / 255.0f blue:102.0f / 255.0f alpha:1.0f] CGColor],
                          (id)[[UIColor colorWithRed:51.0f / 255.0f green:51.0f / 255.0f blue:51.0f / 255.0f alpha:1.0f] CGColor],
                          nil];

    [btn.layer insertSublayer:btnGradient atIndex:0];            
}

But all i get is a button with a drop shadow. I've linked the quartz core library, ive imported it, i've linked the buttons, ive tried using different types of buttons; i'm Stumped. Any Ideas whats going wrong? Thanks in advance.

You only have one button in your array. What exactly are you trying to do here ? — giorashc, Oct 28 '12 at 08:43

score 1 · Answer 1 · edited May 23 '17 at 11:48

1

I faced same problem. It seems you are building for iOS6 as I do. I found that Autolayout for storyboards, introduced in iOS6, is causing such problems. Just disable it if you don't use this feature:

Open storyboard in Xcode
Open properties of storyboard (right pane with properties)
Uncheck "Use Autolayout" in "Interface Builder Document" section.

edited May 23 '17 at 11:48

Community

1
1

answered Nov 13 '12 at 20:34

Oleksandr

419
3
14

This is probably correct. I have answered the linked question. – jrturton Nov 16 '12 at 19:18

score 0 · Answer 2 · answered Oct 28 '12 at 09:13

0

Did you try setting the locations and the start/end points for your gradient ?

btnGradient.locations  = @[@(0.), @(1.)];
btnGradient.startPoint = (CGPoint){0., 0.};
btnGradient.endPoint   = (CGPoint){0., 1.};

answered Oct 28 '12 at 09:13

Cyrille

25,014
12
67
90

score 0 · Answer 3 · answered Oct 28 '12 at 09:17

0

I think you could try to remove any previously existing CAGradientLayer in your button:

for(CALayer* layer in btn.layer.sublayers)
    if ([layer isKindOfClass:[CAGradientLayer class]])
        [layer removeFromSuperlayer];

and then adding your own.

answered Oct 28 '12 at 09:17

sergio

68,819
11
102
123

[http://mobile.tutsplus.com/tutorials/iphone/custom-uibutton_iphone/] i downloaded the source and it work i can't see the difference between the my project and that project – IsaacEllis Oct 28 '12 at 09:46

Problems with CAGradientLayer

3 Answers3